Torsional Damper And Front Crankshaft Seal Replacement - GMC G Service Manual

6A4-14 SMALL BLOCK
2. Cylinder head. Carefully guide the cylinder head into
place over the dowel pins and gasket.
3. Cylinder head bolts. Coat threads of the cylinder head
bolts with sealing compound (GM part number
1052080 or equivalent) and install finger-tight.
H O Tighten
• Cylinder head bolts, a little at a time, using the
sequence shown in figure 15. Proper torque is
90 N«m (65 ft. lbs.).
4. Pushrods. Refer to "Rocker Arm and Pushrod
Replacement" in this section.
H Adjust
• Valves. Refer to "Valve Adjustment" in this
section.
5. Spark plugs.
6. Rocker arm cover. Refer to "Rocker Arm Cover
Replacement" in this section.
7. Components as follows for right side cylinder head on
R/V models:
• AIR pipe at the rear of the cylinder head.
• Spark plug wires to the support brackets.
• Generator.
8. Components as follows for left side cylinder head on
R/V models:
• Air conditioning compressor and front bracket (if
equipped).
• Power steering pump. Refer to POWER
STEERING (SEC. 3B3).
• Coolant sensor wire.
• Spark plug wires to the support brackets.
• AIR pipe at the rear of the cylinder head.
9. Components as follows for right side cylinder head on
G-models with TBI engines:
• AIR pump bolt and spacer at the cylinder head.
• Nut and stud attaching the air conditioning com­
pressor to the cylinder head.
• Fuel pipe, plug wire and wiring harness
brackets at the rear of the cylinder head.
10. Components as follows for left side cylinder head on
G-models with TBI engines:
• Nut and stud attaching main accessory bracket
to the cylinder head.
• Remaining main accessory bracket bolts and
nuts, if necessary.
• Coolant sensor wire.
• Cruise control transducer (if equipped) and
spark plug wire brackets at the rear of the cylin­
der head.
11. Components as follows on carbureted engines:
• Generator (right side cylinder head).
• Air conditioning compressor and bracket (if
equipped) (left side cylinder head). Refer to AIR
CONDITIONING (SEC. 1B).
12. Ground strap at the rear of the cylinder head (right
side cylinder head).
13. Exhaust manifold. Refer to "Exhaust Manifold
Replacement" in this section.
14. Intake manifold. Refer to "Intake Manifold Replace­
ment" in this section.
15. Engine cover (G-models).
16. Battery negative cable.
• Fill the cooling system with the proper quantity and
grade of coolant. Refer to MAINTENANCE AND
LUBRICATION (SEC. 0B).
• Evacuate and charge the air conditioning system.
Refer to AIR CONDITIONING (SEC. 1B).
0 ( S i 0 0 0 0 0
Figure 15 — Cylinder Head Bolt Tightening
Sequence
TORSIONAL DAMPER AND FRONT
CRANKSHAFT SEAL
REPLACEMENT
|f 4 | Remove or Disconnect (Figure 16)
Tool Required:
J 23523-E Torsional Damper Remover and
Installer
1. Fan belts, fan, and pulley. Refer to ENGINE COOL­
ING (SEC. 6B1).
2. Fan shroud assembly.
3. Accessory drive pulley.
4. Torsional damper bolt and washer.
5. Torsional damper. Use J 23523-E (figure 16).
6. Front crankshaft seal. Pry out with a large screw­
driver. Take care not to distort the timing cover.
7. Crankshaft key, if necessary.
lL«l
inspect
• Oil seal contact area on the torsional damper shaft for
grooving and roughness. Replace if necessary.
B-09572